Commit 4c282e51 authored by Like Xu's avatar Like Xu Committed by Paolo Bonzini
Browse files

KVM: x86: Update vCPU's runtime CPUID on write to MSR_IA32_XSS 



Do a runtime CPUID update for a vCPU if MSR_IA32_XSS is written, as the
size in bytes of the XSAVE area is affected by the states enabled in XSS.

Fixes: 20300099 ("kvm: vmx: add MSR logic for XSAVES")
Cc: stable@vger.kernel.org
Signed-off-by: default avatarLike Xu <likexu@tencent.com>
[sean: split out as a separate patch, adjust Fixes tag]
Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
Message-Id: <20220126172226.2298529-3-seanjc@google.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent be4f3b3f

arch/x86/kvm/x86.c

+1 −0
Original line number Diff line number Diff line
@@ -3535,6 +3535,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 
		if (data & ~supported_xss)

			return 1;

		vcpu->arch.ia32_xss = data;

		kvm_update_cpuid_runtime(vcpu);

		break;

	case MSR_SMI_COUNT:

		if (!msr_info->host_initiated)